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  • Apache not running from rc.d on FreeBSD

    - by Oksana Molotova
    I'm using FreeBSD 8.3 and Apache 2.2. I didn't install Apache from ports, instead compiled it from source because I wanted to move the binary and configuration to a different path (I'm centering all of the major production daemons and their configurations in a single place). In any case, I based the /usr/local/etc/rc.d/apache22 file on one from a different server where it was installed from ports, I only modified the binary and config paths within. I can manually execute it with /usr/local/etc/rc.d/apache22 start, however even with apache22_enable="YES" in /etc/rc.conf it fails to start. All permissions and ownership are identical to the other server where it works. What am I missing and is there a way to debug this kind of thing?

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  • Identifying the version of ATI Catalyst drivers

    - by snark
    I have bought a new video card based on the ATI Radeon HD 5670 chipset. I couldn't make it work with the latest ATI Catalyst drivers found on their website, only the drivers found on the CD delivered with the card worked. How can I know the version of Catalyst that is installed on my PC (running Windows 7 64-bits)? The ATI Catalyst Control Center returns the following information: Driver Packaging Version 8.673-091110a-092263C Provider ATI Technologies Inc. 2D Driver Version 8.01.01.973 2D Driver File Path /REGISTRY/MACHINE/SYSTEM/ControlSet001/Control/CLASS/{4D36E968-E325-11CE-BFC1-08002BE10318}/0000 Direct3D Version 8.14.10.0708 OpenGL Version 6.14.10.9120 Catalyst™ Control Center Version 2009.1110.2225.40230 I do not recognize anything pointing to a "marketing version". The website says the current version of Catalyst is 10.2.

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  • Want to execute an arm compiled executable on adb shell of android

    - by user37977
    I stuck in a problem. I want a chmreader executable file to be used in android application. Now whenever I tried to execute it from adb shell, it gives error "permission denied" Now, whenever I use "su" it just executes the file, but doesn't do anything. And whenever I give the argument as the path of the file to be read, "# su /sdcard/extract_chmLib /sdcard/docs/HArdcore.chm" it shows "su: exec failed for /sdcard/docs/HArdcore.chm Error:Permission denied" where "/sdcard/extract_chmLib" is the executable file and "/sdcard/docs/HArdcore.chm" is the chm file to be read. Can you please help me???

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  • Email Deliverability on Yahoo is very poor. Any suggestions please?

    - by xarejay28x
    All other ISPs (Google, AOL, Hotmail) are fantastic, hitting 98-100% in the inbox. Yahoo is very random, and lately our deliverability has dropped drastically. All IPs are senders certified by Return Path and supposedly that automatically whitelists our IPs and allows us to send as many emails as we want (from what my boss says). Do I bother with applying to Yahoo's bulk sender form? I run every email campaign through: SpamAssassin (Excellent Scores) Test Accounts (for test deliverability) Old school HTML format I'm running out of ideas and I'm starting to be in the hot seat and I am very fearful for my job position. If you can offer any wise words i will be very grateful. Thank you in advance.

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  • How can I tell what user account is being used by a service to access a network share on a Windows 2008 server?

    - by Mike B
    I've got a third-party app/service running on a Windows 2003 SP2 server that is trying to fetch something from a network share on Windows 2008 box. Both boxes are members of an AD domain. For some reason, the app is complaining about having insufficient permissions to read/write to the store. The app itself doesn't have any special options for acting on the authority of another user account. It just asks for a UNC path. The service is running with a "log on as" setting of Local System account. I'd like to confirm what account it's using when trying to communicate with the network share. Conversely, I'd also like more details on if/why it's being rejected by the Windows 2008 network share. Are there server-side logs on 2008 that could tell me exactly why a connection attempt to a share was rejected?

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  • Delay of mail delivery - Hosted exchange provider

    - by alex
    Hi, I recently signed up to a new hosted email provider. When I send mail (from OWA, OR Outlook) there is a delay of up to 3 minutes from when i send the message, to when it's received (in my gmail account for example) I've listed the headers below. Is there anything I can advise my new email host to do? My previous email host delivers within 5 seconds!! New email provider: Delivered-To: ****.*****@******.co.uk.test-google-a.com Received: by 10.223.120.148 with SMTP id d20cs333125far; Mon, 30 Nov 2009 08:49:43 -0800 (PST) Received: by 10.213.106.202 with SMTP id y10mr4864870ebo.35.1259599782838; Mon, 30 Nov 2009 08:49:42 -0800 (PST) Return-Path: Received: from relay005.apm-internet.net (relay005.apm-internet.net [85.119.248.8]) by mx.google.com with SMTP id 26si13016480ewy.43.2009.11.30.08.49.42; Mon, 30 Nov 2009 08:49:42 -0800 (PST) Received-SPF: neutral (google.com: 85.119.248.8 is neither permitted nor denied by best guess record for domain of ****@*******.com) client-ip=85.119.248.8; Authentication-Results: mx.google.com; spf=neutral (google.com: 85.119.248.8 is neither permitted nor denied by best guess record for domain of ****@*******.com) smtp.mail=****@*******.com Received: (qmail 63915 invoked from network); 30 Nov 2009 16:49:41 -0000 Received: from unknown (HELO mx-out-manc2.simplymailsolutions.com) (88.151.129.22) by relay005.apm-internet.net with SMTP; 30 Nov 2009 16:49:42 -0000 X-APM-IP: 88.151.129.22 X-APM-Score: 4 Received-SPF: none (relay005.apm-internet.net: domain at alexjamesbrown.com does not designate permitted sender hosts) Received: from [10.1.20.1] (helo=win-s-manc1.shared.ifeltd.com) by mx-out-manc2.simplymailsolutions.com with esmtp (Exim 4.63) (envelope-from ) id 1NF9QZ-0005By-Hw for ****.*****@******.co.uk; Mon, 30 Nov 2009 16:48:46 +0000 Received: from sha-exch8.shared.ifeltd.com ([10.1.20.8]) by win-s-manc1.shared.ifeltd.com with Microsoft SMTPSVC(6.0.3790.3959); Mon, 30 Nov 2009 16:48:34 +0000 Received: from sha-exch9.shared.ifeltd.com ([10.1.20.9]) by sha-exch8.shared.ifeltd.com with Microsoft SMTPSVC(6.0.3790.3959); Mon, 30 Nov 2009 16:48:34 +0000 Received: from SHA-EXCH13.shared.ifeltd.com (10.1.20.13) by sha-exch9.shared.ifeltd.com (10.1.20.9) with Microsoft SMTP Server (TLS) id 8.1.393.1; Mon, 30 Nov 2009 16:48:25 +0000 Received: from SHA-EXCH12.shared.ifeltd.com ([fe80::ecba:36d0:eec5:c928]) by SHA-EXCH13.shared.ifeltd.com ([fe80::212b:916c:70c7:a4e5%11]) with mapi; Mon, 30 Nov 2009 16:48:05 +0000 From: Alex Brown To: "****.*****@*****.co.uk" Date: Mon, 30 Nov 2009 16:48:04 +0000 Subject: testing Thread-Topic: testing Thread-Index: AQHKcdzZg4oiDsOYIEio/7k6bCk8BQ== Message-ID: Accept-Language: en-US, en-GB Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginalArrivalTime: 30 Nov 2009 16:48:34.0235 (UTC) FILETIME=[F48178B0:01CA71DC] Here are the headers using my previous exchange host: Delivered-To: ****.*****@******.co.uk.test-google-a.com Received: by 10.223.120.148 with SMTP id d20cs333076far; Mon, 30 Nov 2009 08:48:35 -0800 (PST) Received: by 10.213.2.70 with SMTP id 6mr4797985ebi.25.1259599715739; Mon, 30 Nov 2009 08:48:35 -0800 (PST) Return-Path: Received: from relay005.apm-internet.net (relay005.apm-internet.net [85.119.248.8]) by mx.google.com with SMTP id 26si13030993ewy.23.2009.11.30.08.48.35; Mon, 30 Nov 2009 08:48:35 -0800 (PST) Received-SPF: neutral (google.com: 85.119.248.8 is neither permitted nor denied by best guess record for domain of ****@*********.com) client-ip=85.119.248.8; Authentication-Results: mx.google.com; spf=neutral (google.com: 85.119.248.8 is neither permitted nor denied by best guess record for domain of ****@*********.com) smtp.mail=****@*********.com Received: (qmail 60920 invoked from network); 30 Nov 2009 16:48:34 -0000 Received: from unknown (HELO MTAb.MsExchange2007.com) (89.31.236.50) by relay005.apm-internet.net with SMTP; 30 Nov 2009 16:48:35 -0000 X-APM-IP: 89.31.236.50 X-APM-Score: 1 Received-SPF: none (relay005.apm-internet.net: domain at alexjamesbrown.com does not designate permitted sender hosts) Received: from EXHUB02.SL.local (no.ptr.hostlogic.biz [89.31.236.28]) by MTAb.MsExchange2007.com (Spam Firewall) with ESMTP id B677A34FE0F for ; Mon, 30 Nov 2009 16:48:33 +0000 (GMT) Received: from EXHUB02.SL.local (no.ptr.hostlogic.biz [89.31.236.28]) by MTAb.MsExchange2007.com with ESMTP id 8X5B8V4tExVzoNyU for ; Mon, 30 Nov 2009 16:48:34 +0000 (GMT) Received: from EXCCR03STORE.SL.local ([10.0.0.2]) by EXHUB02.SL.local ([192.168.92.64]) with mapi; Mon, 30 Nov 2009 16:48:31 +0000 From: Alex James Brown To: "****.*****@******.co.uk" Date: Mon, 30 Nov 2009 16:48:30 +0000 Subject: testing from o Thread-Topic: testing from o Thread-Index: AQHKcdzyY1iBFWiol0ykG6xPQUZiTg== Message-ID: Accept-Language: en-US, en-GB Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0

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  • install headers-more-nginx-module to existing nginx

    - by Hunt
    i have installed nginx but now i want to install headers-more-nginx-module into existing installation of nginx , so can someone tell me how to do it ? i have found following commands but it is with the new installation of nginx and then headers-more-nginx-module wget 'http://nginx.org/download/nginx-1.2.4.tar.gz' tar -xzvf nginx-1.2.4.tar.gz cd nginx-1.2.4/ # Here we assume you would install you nginx under /opt/nginx/. ./configure --prefix=/opt/nginx \ --add-module=/path/to/headers-more-nginx-module make make install currently i guess my nginx is under where the nginx.conf is placed etc/nginx

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  • Role of Microsoft certifications ADO.Net, ASP.Net, WPF, WCF and Career?

    - by Steve Johnson
    I am a Microsoft fan and .Net enthusiast. I want to align my career in the lines of current and future .Net technologies. I have an MCTS in ASP.Net 3.5. The question is about the continuation of certifications and my career growth and maybe a different job! I want to keep pace with future Microsoft .Net technologies. My current job however doesn't allow so.So i bid to do .Net based certifications to stay abreast with latest .Net technologies. My questions: What certifications should i follow next? I have MCTS .Net 3.5 WPF(Exam 70-502) and MCTS .Net 3.5 WCF(Exam 70-504) in my mind so that i can go for Silverlight development and seek jobs related to Silverlight development. What other steps i need to take in order to develop professional expertise in technologies such as WPF, WCF and Silverlight when my current employer is reluctant to shift to latest .Net technologies? I am sure that there are a lot of people of around here who are working with .Net technologies and they have industrial experience. I being a new comer and starter in my career need to take right decision and so i am seeking help from this community in guiding me to the right path. Expert replies are much appreciated and thanks in advance. Best Regards Steve.

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  • Executing a Batch file from remote Ax client on an AOS server

    - by Anisha
    Is it possible to execute a batch file on an AOS server from a remote AX client? Answer is yes, provided you have necessary permission for this execution on the server. Please create a batch file on your AOS server. Some thing as below for creating a directory on the server.    Insert a command something like this in a .BAT file (batch file) and place any were on the server.   Mkdir “c:\test”      Copy the following code into your server static method of your class and call this piece of code from a button click on Ax form. Please execute this button click from a remote AX client and see the result . This should execute the batch file on the server and should create a directory called ‘test’ on the root directoryof the server.     server static void AOS_batch_file_create() { boolean b; System.Diagnostics.Process process; System.Diagnostics.ProcessStartInfo processStartInfo; ; b = Global::isRunningOnServer(); infolog.add(0, int2str(b)); new InteropPermission(InteropKind::ClrInterop).assert(); process = new System.Diagnostics.Process(); processStartInfo = new System.Diagnostics.ProcessStartInfo(); processStartInfo.set_FileName("C:\\create_dir.bat"); // batch file path on the AOS server process.set_StartInfo(processStartInfo); process.Start(); //process.Refresh(); //process.Close(); //process.WaitForExit(); info("Finished"); }

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  • BizTalk: mapping with Xslt

    - by Leonid Ganeline
    BizTalk Map Editor (Mapper) is a good editor, especially in the last 2010 version of the BizTalk. But still sometimes it cannot do the tasks easily. It is time for the Xslt code, It is time to remember that the maps are executed by the Xslt engine.  Right-click the Mapper Grid (a field between the source and target schemas) and choose Properties /Custom XSLT Path.  Input here a name of the file with Xslt code. Only this code will be executed, forget the picture in the Mapper, all those links and functoids.  Let’s see the real-life example. There are two source Addresses. One is on the top level and the second is inside the Member_Address record with MaxOccurs=* . The target address is placed inside the Locator record with MaxOccurs=*. The requirement is to map all source address to the one target address structure. The source Xml document looks like: The result Xml should be like this: Try to do this mapping with the Mapper and you will spent good amount of time and the result map would be tricky. If we use the Xslt code, the mapping will be simple and unambiguous, like this: Simple, elegant.

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  • KVM CLI install for CentOS 6.3 defaults to Minimal Install

    - by i.h4d35
    So I now I've installed KVM (and its associated tools and packages- libvirt, VMM etc.). On the GUI (i.e using the VMM), installation works as its supposed to. However, when I try to create a VM using the command line interface, the OS (I am working with CentOS 6.3) defaults to a Minimal Install instead of giving me options to choose from at the time of installation. I am trying to install using the following command: virt-install \ --connect qemu:///system \ --virt-type kvm --name testVM2 \ --ram 512 --disk path=/var/lib/libvirt/images/testVM2.img,size=8 --vnc \ --cdrom /media/db18de8e-0853-49fb-80de-5c794d58a46f/CentOS-6.3- x86_64-bin-DVD1.iso \ --network network=default Specifying the OS-type or the OS-variant parameters doesn't make a difference. Is there something that I am missing out on or some other parameter that I must specify? Thanks in advance.

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  • Create a Social Community of Trust Along With Your Federal Digital Services Governance

    - by TedMcLaughlan
    The Digital Services Governance Recommendations were recently released, supporting the US Federal Government's Digital Government Strategy Milestone Action #4.2 to establish agency-wide governance structures for developing and delivering digital services. Figure 1 - From: "Digital Services Governance Recommendations" While extremely important from a policy and procedure perspective within an Agency's information management and communications enterprise, these recommendations only very lightly reference perhaps the most important success enabler - the "Trusted Community" required for ultimate usefulness of the services delivered. By "ultimate usefulness", I mean the collection of public, transparent properties around government information and digital services that include social trust and validation, social reach, expert respect, and comparative, standard measures of relative value. In other words, do the digital services meet expectations of the public, social media ecosystem (people AND machines)? A rigid governance framework, controlling by rules, policies and roles the creation and dissemination of digital services may meet the expectations of direct end-users and most stakeholders - including the agency information stewards and security officers. All others who may share comments about the services, write about them, swap or review extracts, repackage, visualize or otherwise repurpose the output for use in entirely unanticipated, social ways - these "stakeholders" will not be governed, but may observe guidance generated by a "Trusted Community". As recognized members of the trusted community, these stakeholders may ultimately define the right scope and detail of governance that all other users might observe, promoting and refining the usefulness of the government product as the social ecosystem expects. So, as part of an agency-centric governance framework, it's advised that a flexible governance model be created for stewarding a "Community of Trust" around the digital services. The first steps follow the approach outlined in the Recommendations: Step 1: Gather a Core Team In addition to the roles and responsibilities described, perhaps a set of characteristics and responsibilities can be developed for the "Trusted Community Steward/Advocate" - i.e. a person or team who (a) are entirely cognizant of and respected within the external social media communities, and (b) are trusted both within the agency and outside as practical, responsible, non-partisan communicators of useful information. The may seem like a standard Agency PR/Outreach team role - but often an agency or stakeholder subject matter expert with a public, active social persona works even better. Step 2: Assess What You Have In addition to existing, agency or stakeholder decision-making bodies and assets, it's important to take a PR/Marketing view of the social ecosystem. How visible are the services across the social channels utilized by current or desired constituents of your agency? What's the online reputation of your agency and perhaps the service(s)? Is Search Engine Optimization (SEO) a facet of external communications/publishing lifecycles? Who are the public champions, instigators, value-adders for the digital services, or perhaps just influential "communicators" (i.e. with no stake in the game)? You're essentially assessing your market and social presence, and identifying the actors (including your own agency employees) in the existing community of trust. Step 3: Determine What You Want The evolving Community of Trust will most readily absorb, support and provide feedback regarding "Core Principles" (Element B of the "six essential elements of a digital services governance structure") shared by your Agency, and obviously play a large, though probably very unstructured part in Element D "Stakeholder Input and Participation". Plan for this, and seek input from the social media community with respect to performance metrics - these should be geared around the outcome and growth of the trusted communities actions. How big and active is this community? What's the influential reach of this community with respect to particular messaging or campaigns generated by the Agency? What's the referral rate TO your digital services, FROM channels owned or operated by members of this community? (this requires governance with respect to content generation inclusive of "markers" or "tags"). At this point, while your Agency proceeds with steps 4 ("Build/Validate the Governance Structure") and 5 ("Share, Review, Upgrade"), the Community of Trust might as well just get going, and start adding value and usefulness to the existing conversations, existing data services - loosely though directionally-stewarded by your trusted advocate(s). Why is this an "Enterprise Architecture" topic? Because it's increasingly apparent that a Public Service "Enterprise" is not wholly contained within Agency facilities, firewalls and job titles - it's also manifested in actual, perceived or representative forms outside the walls, on the social Internet. An Agency's EA model and resulting investments both facilitate and are impacted by the "Social Enterprise". At Oracle, we're very active both within our Enterprise and outside, helping foster social architectures that enable truly useful public services, digital or otherwise.

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  • I can't run uwsgi as normal user

    - by atomAltera
    I want to run uwsgi server as www user, but if I write: uwsgi --socket $SOCKET --chmod-socket 666 --pidfile $PIDFILE --daemonize $LOGFILE --chdir $CHDIR --pp $PYTHONPATH --module main --post-buffering 8192 --workers 1 --threads 10 --uid www --gid www A socket creation error occurs: Log: 1 *** Starting uWSGI 1.4.1 (64bit) on [Mon Dec 10 22:15:23 2012] *** 2 compiled with version: 4.4.5 on 17 November 2012 23:31:14 3 os: Linux-2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012 4 nodename: autoblog 5 machine: x86_64 6 clock source: unix 7 pcre jit disabled 8 detected number of CPU cores: 2 9 current working directory: / 10 writing pidfile to /tmp/uwsgi_mysite.pid 11 detected binary path: /usr/local/bin/uwsgi 12 setgid() to 1002 13 set additional group 1004 (files) 14 setuid() to 1002 15 *** WARNING: you are running uWSGI without its master process manager *** 16 your memory page size is 4096 bytes 17 detected max file descriptor number: 1024 18 lock engine: pthread robust mutexes 19 unlink(): Operation not permitted [core/socket.c line 109] 20 bind(): Address already in use [core/socket.c line 141]

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  • Publish Static Content to WebLogic

    - by James Taylor
    Most people know WebLogic has a built in web server. Typically this is not an issue as you deploy java applications and WebLogic publishes to the web. But what if you just want to display a simple static HTML page. In WebLogic you can develop a simple web application to display static HTML content. In this example I used WLS 10.3.3. I want to display 2 files, an HTML file, and an xsd for reference. Create a directory of your choice, this is what I will call the document root. mkdir /u01/oracle/doc_root Copy the static files to this directory  In the document root directory created in step 1 create the directory WEB-INF mkdir WEB-INF In the WEB-INF directory create a file called web.xml with the following content <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/j2ee/dtds/web-app_2_3.dtd"> <web-app> </web-app> Login to the WebLogic console to deploy application Click on Deployments Click on Lock & Edit Click Install and set the path to the directory created in step 1 Leave default "Install this deployment as an application" and click Next Select a Managed Server to deploy to and click Next Accept the defaults and click Finish  Deployment completes successfully, now click the Activate Changes You should now see the application started in the deployments You can now access your static content via the following URL http://localhost:7001/doc_root/helloworld.html

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  • Jailkit - allowing use of Java/Python

    - by James hooker
    I'm looking to allow Jailed users to use JAVA (JRE) to execute their own Java files, similarly with Python to execute py scripts. I've tried adding the JAVA binary (/usr/bin/java) to a jail using the following jk_cp /path/to/jail /usr/bin/java This seems to copy some of the libraries across, aswell as the Java binary itself, however the jailed user is still unable to execute Java. It complains first of all of a missing lib called libsli.so. I copied that across and it then complains about libjava.so which I proceeded to copy across to, to no avail. Does anyone have experience with enabling the execution of Java within a jailed environment? This is under Ubuntu 10.04 64-bit, with Jailkit 2.11.

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  • Cannot set MemOpMode or ProcVirtualization with syscfg.exe

    - by EGr
    When attempting to set MemOpMode or ProcVirtualization with syscfg.exe, I get the following error: C:\Users\EGr>syscfg --MemOpMode=AdvEccMode System Services or CSIOR disabled In the past, I have been told that this can be resolved by forcefully reinstalling the Dell Lifecycle controller firmware, and then trying again; however, I cannot find my notes on how to do that. Has anyone ever run into this issue, and does anyone know how I can fix it? If it is possible to forcefully reinstall the firmware, how would I do that? I've tried running the installer, but it fails after running for ~2 min. I believe there is a way to fix this as well, by adding/modifying a registry value at HKLM\System\Control\CurrentControlSet\Services\IPMIDRV (that might not be the correct path, but I know it is IPMIDRV). Is this a common issue? What is the actual cause of it?

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  • Organizations &amp; Architecture UNISA Studies &ndash; Chap 7

    - by MarkPearl
    Learning Outcomes Name different device categories Discuss the functions and structure of I/.O modules Describe the principles of Programmed I/O Describe the principles of Interrupt-driven I/O Describe the principles of DMA Discuss the evolution characteristic of I/O channels Describe different types of I/O interface Explain the principles of point-to-point and multipoint configurations Discuss the way in which a FireWire serial bus functions Discuss the principles of InfiniBand architecture External Devices An external device attaches to the computer by a link to an I/O module. The link is used to exchange control, status, and data between the I/O module and the external device. External devices can be classified into 3 categories… Human readable – e.g. video display Machine readable – e.g. magnetic disk Communications – e.g. wifi card I/O Modules An I/O module has two major functions… Interface to the processor and memory via the system bus or central switch Interface to one or more peripheral devices by tailored data links Module Functions The major functions or requirements for an I/O module fall into the following categories… Control and timing Processor communication Device communication Data buffering Error detection I/O function includes a control and timing requirement, to coordinate the flow of traffic between internal resources and external devices. Processor communication involves the following… Command decoding Data Status reporting Address recognition The I/O device must be able to perform device communication. This communication involves commands, status information, and data. An essential task of an I/O module is data buffering due to the relative slow speeds of most external devices. An I/O module is often responsible for error detection and for subsequently reporting errors to the processor. I/O Module Structure An I/O module functions to allow the processor to view a wide range of devices in a simple minded way. The I/O module may hide the details of timing, formats, and the electro mechanics of an external device so that the processor can function in terms of simple reads and write commands. An I/O channel/processor is an I/O module that takes on most of the detailed processing burden, presenting a high-level interface to the processor. There are 3 techniques are possible for I/O operations Programmed I/O Interrupt[t I/O DMA Access Programmed I/O When a processor is executing a program and encounters an instruction relating to I/O it executes that instruction by issuing a command to the appropriate I/O module. With programmed I/O, the I/O module will perform the requested action and then set the appropriate bits in the I/O status register. The I/O module takes no further actions to alert the processor. I/O Commands To execute an I/O related instruction, the processor issues an address, specifying the particular I/O module and external device, and an I/O command. There are four types of I/O commands that an I/O module may receive when it is addressed by a processor… Control – used to activate a peripheral and tell it what to do Test – Used to test various status conditions associated with an I/O module and its peripherals Read – Causes the I/O module to obtain an item of data from the peripheral and place it in an internal buffer Write – Causes the I/O module to take an item of data form the data bus and subsequently transmit that data item to the peripheral The main disadvantage of this technique is it is a time consuming process that keeps the processor busy needlessly I/O Instructions With programmed I/O there is a close correspondence between the I/O related instructions that the processor fetches from memory and the I/O commands that the processor issues to an I/O module to execute the instructions. Typically there will be many I/O devices connected through I/O modules to the system – each device is given a unique identifier or address – when the processor issues an I/O command, the command contains the address of the address of the desired device, thus each I/O module must interpret the address lines to determine if the command is for itself. When the processor, main memory and I/O share a common bus, two modes of addressing are possible… Memory mapped I/O Isolated I/O (for a detailed explanation read page 245 of book) The advantage of memory mapped I/O over isolated I/O is that it has a large repertoire of instructions that can be used, allowing more efficient programming. The disadvantage of memory mapped I/O over isolated I/O is that valuable memory address space is sued up. Interrupts driven I/O Interrupt driven I/O works as follows… The processor issues an I/O command to a module and then goes on to do some other useful work The I/O module will then interrupts the processor to request service when is is ready to exchange data with the processor The processor then executes the data transfer and then resumes its former processing Interrupt Processing The occurrence of an interrupt triggers a number of events, both in the processor hardware and in software. When an I/O device completes an I/O operations the following sequence of hardware events occurs… The device issues an interrupt signal to the processor The processor finishes execution of the current instruction before responding to the interrupt The processor tests for an interrupt – determines that there is one – and sends an acknowledgement signal to the device that issues the interrupt. The acknowledgement allows the device to remove its interrupt signal The processor now needs to prepare to transfer control to the interrupt routine. To begin, it needs to save information needed to resume the current program at the point of interrupt. The minimum information required is the status of the processor and the location of the next instruction to be executed. The processor now loads the program counter with the entry location of the interrupt-handling program that will respond to this interrupt. It also saves the values of the process registers because the Interrupt operation may modify these The interrupt handler processes the interrupt – this includes examination of status information relating to the I/O operation or other event that caused an interrupt When interrupt processing is complete, the saved register values are retrieved from the stack and restored to the registers Finally, the PSW and program counter values from the stack are restored. Design Issues Two design issues arise in implementing interrupt I/O Because there will be multiple I/O modules, how does the processor determine which device issued the interrupt? If multiple interrupts have occurred, how does the processor decide which one to process? Addressing device recognition, 4 general categories of techniques are in common use… Multiple interrupt lines Software poll Daisy chain Bus arbitration For a detailed explanation of these approaches read page 250 of the textbook. Interrupt driven I/O while more efficient than simple programmed I/O still requires the active intervention of the processor to transfer data between memory and an I/O module, and any data transfer must traverse a path through the processor. Thus is suffers from two inherent drawbacks… The I/O transfer rate is limited by the speed with which the processor can test and service a device The processor is tied up in managing an I/O transfer; a number of instructions must be executed for each I/O transfer Direct Memory Access When large volumes of data are to be moved, an efficient technique is direct memory access (DMA) DMA Function DMA involves an additional module on the system bus. The DMA module is capable of mimicking the processor and taking over control of the system from the processor. It needs to do this to transfer data to and from memory over the system bus. DMA must the bus only when the processor does not need it, or it must force the processor to suspend operation temporarily (most common – referred to as cycle stealing). When the processor wishes to read or write a block of data, it issues a command to the DMA module by sending to the DMA module the following information… Whether a read or write is requested using the read or write control line between the processor and the DMA module The address of the I/O device involved, communicated on the data lines The starting location in memory to read from or write to, communicated on the data lines and stored by the DMA module in its address register The number of words to be read or written, communicated via the data lines and stored in the data count register The processor then continues with other work, it delegates the I/O operation to the DMA module which transfers the entire block of data, one word at a time, directly to or from memory without going through the processor. When the transfer is complete, the DMA module sends an interrupt signal to the processor, this the processor is involved only at the beginning and end of the transfer. I/O Channels and Processors Characteristics of I/O Channels As one proceeds along the evolutionary path, more and more of the I/O function is performed without CPU involvement. The I/O channel represents an extension of the DMA concept. An I/O channel ahs the ability to execute I/O instructions, which gives it complete control over I/O operations. In a computer system with such devices, the CPU does not execute I/O instructions – such instructions are stored in main memory to be executed by a special purpose processor in the I/O channel itself. Two types of I/O channels are common A selector channel controls multiple high-speed devices. A multiplexor channel can handle I/O with multiple characters as fast as possible to multiple devices. The external interface: FireWire and InfiniBand Types of Interfaces One major characteristic of the interface is whether it is serial or parallel parallel interface – there are multiple lines connecting the I/O module and the peripheral, and multiple bits are transferred simultaneously serial interface – there is only one line used to transmit data, and bits must be transmitted one at a time With new generation serial interfaces, parallel interfaces are becoming less common. In either case, the I/O module must engage in a dialogue with the peripheral. In general terms the dialog may look as follows… The I/O module sends a control signal requesting permission to send data The peripheral acknowledges the request The I/O module transfers data The peripheral acknowledges receipt of data For a detailed explanation of FireWire and InfiniBand technology read page 264 – 270 of the textbook

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  • Recovering drivers from previous installation?

    - by Walkerneo
    Yesterday I bought a new computer and I've been setting it up since this morning. The hard drive came with windows 7 home premium (x64) installed, but I decided to instead install windows 7 ultimate (x64) - this is what I'm currently using. Unfortunately, there were some drivers that were installed that I need in this installation. I only notice because the computer doesn't have the ethernet drivers, so I'm only able to connect to the internet via wireless. There are other drivers missing as well, but I'm not yet seeing the effects. I still have the Windows.old folder with the previous installation, which has the drivers. Is there any way to copy the necessary ones over? I tried the options for updating driver software through device manager with the path set to System32\drivers of the old installation, but it didn't find anything.

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  • Keyboard locking up in Visual Studio 2010, Part 2

    - by Jim Wang
    Last week I posted about looking into the keyboard locking up issue in Visual Studio.  So far it looks like not a lot of people have replied to provide concrete repro steps, which confirms my suspicion that this is somewhat of a random issue. So at this point, I have a couple of choices.  I can either wait for somebody in the community to provide a repro of the problem that I can reliably run into, or I can do the work myself. I’m going to do both, so while I’m waiting for more possible bug reports, I’m going to write a tool that models the behavior of a typical Visual Studio user and use that to hopefully isolate the problem. I’ve chosen to go with this path since given the information in the bug reports, it seems people hit the issue with many different configurations in many different scenarios.  This means that me sitting down without any solid repro steps is likely not going to be a good use of time.  Instead, I’m going to go with a model-based testing approach where I will define a series of actions that a user in VS can do, and then proceed to run my model.  I’ll let you guys know how this works out for isolating bugs :) I’m using an internal tool for the model engine and AutoIt for the UI automation (I want something lightweight for a one-off).  One of the challenges will be getting feedback: AutoIt is great at driving, but not so great at understanding what success and failure means.

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  • Shockwave Flash crashes with Chromium and Firefox

    - by Stephan
    Since updating to Ubuntu 13.10, Shockwave Flash does not work in Chromium or Firefox. Both show a "Shockwave Flash has crashed" dialog. Chromium 29.0.1547.65 After loading a page with a Flash video, I get this warning on the console twice: NVIDIA: could not open the device file /dev/nvidia0 (Operation not permitted). When I try to play the video, it crashes and I receive these disorted error messages: (exe:14868): Gdk-WARNING **: XID collision, trouble ahead [xcb] Extra reply data still left in queue [xcb] This is most likely caused by a broken X extension library [xcb] Aborting, sorry about that. owser --type=plugin --plugin-path=/usr/lib/flashplugin-installer/libflashplayer.so --lang=de --channel=14560.18.20766867: ../../src/xcb_io.c:576: _XReply: Assertion `!xcb_xlib_extra_reply_data_left' failed. Firefox 25.0 With Firefox, I get these errors: ###!!! ABORT: Request 154.24: BadValue (integer parameter out of range for operation); 3 requests ago: file /build/buildd/firefox-25.0+build3/toolkit/xre/nsX11ErrorHandler.cpp, line 157 WARNING: pipe error (110): Connection reset by peer: file /build/buildd/firefox-25.0+build3/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 437 ###!!! [Parent][RPCChannel] Error: Channel error: cannot send/recv What I tried so far Reinstalling flashplugin-installer Changing permissions of /dev/nvidia0 It seems that Flash Aid is no longer available. GPU acceleration is working fine, e.g. for Portal. Does anyone know how to fix this?

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  • Running django custom management commands with supervisord

    - by mfsaint
    I'd like to use supervisord to run some commands for my Django project but I keep getting the following error: supervisor.log: 2012-05-18 17:52:15,784 INFO spawnerr: can't find command 'source' If I remove the "source" command, the log shows the same error: can't find command 'python'. supervisord.conf excerpt: [program:django] directory=/home/mf/projects/djangopj/ command=beanstalkd -l 127.0.0.1 -p 11300 command=source /home/mf/virtualenvs/env/bin/activate command=python manage.py command1 command=python manage.py command2 user=mf autostart=true autorestart=true I tried removing the directory and adding the absolute path to the commands but I kept getting the same error. I run supervisord with the following command: supervisord -c supervisord.conf -l supervisor.log

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  • Arch Linux with an nginx/django setup refuses to display ANYTHING

    - by Holland
    I'm on Amazon Ec2, with an Arch Linux server. While I truly am loving it, I'm having the issue of actually getting nginx to display anything. Everytime I try to throw my hostname into the browser, the browser states that it's not available for some reason - almost as if the host doesn't even exist. One thing I'd like to know is, how can I get this up and running? Is there a specific arch linux configuration I have to do to make it web accessible? I have port 80 open, as well as port 22. I've tried using gunicorn, python-flup, and nginx. Nginx Config user http; worker_processes 1; #error_log logs/error.log; #error_log logs/error.log notice; #error_log logs/error.log info; pid logs/nginx.pid; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; access_log logs/access.log main; sendfile on; #tcp_nopush on; #keepalive_timeout 0; keepalive_timeout 65; #gzip on; server { listen 80; server_name _; access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; #charset koi8-r; location ^~ /media/ { root /path/to/media; } location ^~ /admin-media/ { root /usr/lib/python2.7/site-packages/django/contrib/admin/media; } location / { root /path/to/root/; fastcgi_pass 127.0.0.1:8080; fastcgi_param SERVER_NAME $server_name; fastcgi_param SERVER_PORT $server_port; fastcgi_param SERVER_PROTOCOL $server_protocol; fastcgi_param PATH_INFO $fastcgi_script_name; fastcgi_param REQUEST_METHOD $request_method; fastcgi_param QUERY_STRING $query_string; fastcgi_param CONTENT_TYPE $content_type; fastcgi_param CONTENT_LENGTH $content_length; fastcgi_pass_header Authorization; fastcgi_intercept_errors off; fastcgi_index index.html; index index.htm index.html; } error_page 500 502 503 504 /50x.html; location = /50x.html { root /etc/nginx/html/50x.html; } } # server { # listen 80; # server_name localhost; #charset koi8-r; #access_log logs/host.access.log main; # location / { # root html; # index index.html index.htm; # } #error_page 404 /404.html; # redirect server error pages to the static page /50x.html # #error_page 500 502 503 504 /50x.html; #location = /50x.html { root html; #} # proxy the PHP scripts to Apache listening on 127.0.0.1:80 # #location ~ \.php$ { # proxy_pass http://127.0.0.1; #} # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000 # #location ~ \.php$ { # root html; # fastcgi_pass 127.0.0.1:9000; # fastcgi_index index.php; # fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name; # include fastcgi_params; #} # deny access to .htaccess files, if Apache's document root # concurs with nginx's one # #location ~ /\.ht { # deny all; #} #} # another virtual host using mix of IP-, name-, and port-based configuration # #server { # listen 8000; # listen somename:8080; # server_name somename alias another.alias; # location / { # root html; # index index.html index.htm; # } #} # HTTPS server # #server { # listen 443; # server_name localhost; # ssl on; # ssl_certificate cert.pem; # ssl_certificate_key cert.key; # ssl_session_timeout 5m; # ssl_protocols SSLv2 SSLv3 TLSv1; # ssl_ciphers HIGH:!aNULL:!MD5; # ssl_prefer_server_ciphers on; # location / { # root html; # index index.html index.htm; # } #} } I can't quite tell if it's a server issue or a configuration issue: I've followed so many guides now I can't even count them all. The thing is that Django itself is working fine, and my permissions to the document root of the where the site files are stored is 777. Ontop of that, I have a git repo which works perfectly fine, and django, python, and runfcgi all start without issues. The same goes for gunicorn, when I do a gunicorn_django -b 0.0.0.0:8000 in my document root. Here is my output from that: 2012-04-15 05:17:37 [3124] [INFO] Starting gunicorn 0.14.2 2012-04-15 05:17:37 [3124] [INFO] Listening at: http://0.0.0.0:8081 (3124) 2012-04-15 05:17:37 [3124] [INFO] Using worker: sync 2012-04-15 05:17:37 [3127] [INFO] Booting worker with pid: 3127 As far as I know, everything seems fine, as well as error.log and access.log for nginx. The access log is completely blank, for that matter. I just feel lost here; what would be a step in the right direction to bebugging an issue such as this?

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  • Sharing an Apache configuration between testing vs. production

    - by Kevin Reid
    I have a personal web site with a slightly nontrivial Apache configuration. I test changes on my personal machine before uploading them to the server. The path to the files on disk and the root URL of the site are of course different between the test and production conditions, and they occur many places in the configuration (especially <Directory blocks for special locations which have scripts or no directory listing or ...). What is the best way to share the common elements of the configuration, to make sure that my production environment matches my test environment as closely as possible? What I've thought of is to use SetEnv to store the paths for the current machine in environment variables, then Include a common configuration file with ${} everywhere there's something machine specific. Any hazards of this method?

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  • How to fix Failed to initialize Windows Azure storage emulator error

    - by ybbest
    When you press F5 to start debugging Azure project, you might get the following exception: If you go to the Output windows, you will see the detailed error message below: Windows Azure Tools: Failed to initialize Windows Azure storage emulator. Unable to start Development Storage. Failed to start Development Storage: the SQL Server instance ‘localhost\SQLExpress’ could not be found. Please configure the SQL Server instance for Development Storage using the ‘DSInit’ utility in the Windows Azure SDK. This is because by default, Azure uses the SQLExpress to start Development Storage. To fix this you can do the following: You need to open command prompt, and navigate to C:\Program Files\Windows Azure SDK\v1.4\bin\devstore (depending on your Azure version, the file path is slightly different.) Next, run DSInit /sqlInstance:. (. Means the SQL Server use the default instance, if you have name instance, you need to change. to the name of the SQL Server) After a short while, you should see the following windows showing the configuration succeeds. You can download a batch file here. References: http://msdn.microsoft.com/en-us/library/gg433132.aspx

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  • How to easily upgrade MySQL 5.0.32 to MySQL 5.1.20 or higher on Debian Etch?

    - by Ferdy
    I have a home server running Debian Etch with MySQL 5.0.32 on it. I'm not much of a Linux administrator but two years ago I installed the server and it runs fine. I used the official MySQL package for Debian at that time. Since then I have been happily making use of it. Now I need to use a MySQL function that is only available in MySQL 5.1.20 and higher. Therefore I would like to upgrade. I'm not that confident in messing with something I need every day so I wanted to check with you what the best upgrade path would be? Obviously I prefer a simple upgrade that keeps my database, users and settings in place as they are now.

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